Rolled Oats (Old-Fashioned): US Cups to Grams (g) & Cooked Volume Conversion
Convert volumes of uncooked rolled oats (also known as old-fashioned oats) measured in US cups to its approximate weight in metric grams (g) and estimate the resulting cooked volume for oatmeal.
US Cups (Uncooked Rolled Oats)
Grams (g) (approx.)
Cooked Volume (US Cups) (approx.)
1/4 cup
20-23 g
~1/2 cup
1/3 cup
27-30 g
~2/3 cup
1/2 cup
40-45 g
~1 cup
2/3 cup
53-60 g
~1 1/3 cups
3/4 cup
60-68 g
~1 1/2 cups
1 cup
80-90 g (often ~80g or 85g)
~2 cups
Important Considerations for Rolled Oats:
Rolled oats are relatively light. The weight of 1 US cup of uncooked rolled oats is typically around **80-90 grams** (approximately 2.8-3.2 ounces).
When cooked with liquid (e.g., water or milk) for oatmeal, rolled oats generally expand to about **twice their original volume**. The amount of liquid used can affect the final consistency and volume.
This chart refers to old-fashioned rolled oats. Quick oats or instant oats may have different densities and cooking characteristics. Steel-cut oats are significantly denser and have different cooking times/expansion.
For consistent results in baking or precise portioning, measuring oats by weight can be beneficial.